I made a lot of windows with the vertical split option
Option 1 (without closing your file)


On the Workspace bar click on + to add a new workspace
Optional: delete the old one

Option 2

Save File and close Blender
Than open Blender again
Click top left on File &gt; Open
In the pop-up screen click top right on the Gear Icon
Uncheck Load UI (user interface)
Select your File to Open